EP0940963B1 - Stromversorgungseinrichtung und Verfahren für ein mobiles Fernsprech- Endgerät - Google Patents

Stromversorgungseinrichtung und Verfahren für ein mobiles Fernsprech- Endgerät Download PDF

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Publication number
EP0940963B1
EP0940963B1 EP99102881A EP99102881A EP0940963B1 EP 0940963 B1 EP0940963 B1 EP 0940963B1 EP 99102881 A EP99102881 A EP 99102881A EP 99102881 A EP99102881 A EP 99102881A EP 0940963 B1 EP0940963 B1 EP 0940963B1
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EP
European Patent Office
Prior art keywords
voltage
output
transmission
output voltage
converter
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Expired - Lifetime
Application number
EP99102881A
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English (en)
French (fr)
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EP0940963A3 (de
EP0940963A2 (de
Inventor
Jae-Sun Park
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication of EP0940963A3 publication Critical patent/EP0940963A3/de
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof

Definitions

  • the present invention relates to a power supply apparatus and method for a mobile communication terminal, and in particular, to a power supply apparatus and method which is favorable for a reduction in size and an increase in power efficiency of a mobile communication terminal.
  • a mobile communication terminal such as a CDMA (Code Division Multiple Access) terminal and a GSM (Global System for Mobile communication) terminal, employs a rechargeable battery for providing the mobile communication terminal with a power supply voltage.
  • a power supply apparatus of the mobile communication terminal includes DC/DC converters for converting a DC voltage provided from the battery to several operating voltages for each part of the mobile communication terminal.
  • FIG. 1 illustrates a conventional power supply apparatus for a mobile communication terminal.
  • the power supply apparatus down-converts (or steps down) a DC voltage 7.2V provided from a battery 10 to a DC voltage 3.9V for a receiver and baseband signal processor 30 and to a DC voltage 5.0V for a transmitter and power amplifier 40.
  • the conventional power supply apparatus includes a DC/DC converter 20 for converting the DC voltage 7.2V supplied from the battery 10 to the DC voltage 3.9V for the receiver and baseband signal processor 30, and a DC/DC converter 22 for converting the DC voltage 7.2V supplied from the battery 10 to the DC voltage 5.0V for the transmitter and power amplifier 40.
  • the DC voltage output from the DC/DC converter 22 is provided to the transmitter and power amplifier 40 by way of a switch SW, in order to provide the converted DC voltage output from the DC/DC converter 22 to the transmitter and power amplifier 40 only in a transmission mode so that the power consumption may be reduced in a reception mode.
  • the mobile communication terminal reduces The overall power consumption and extends the battery life.
  • the conventional power supply apparatus includes several DC/DC converters, which is disadvantageous to a reduction in size of the mobile communication terminal.
  • US-A-5 655 220 relates to power control in a radiotelephone system. It is suggested to enable a radiotelephone to operate in a linear fashion over a wide dynamic range while maintaining acceptable transmit output power levels inside and outside of the return link bandwidth.
  • the forward and return link power are measured by power detectors and input to an analog to digital converter accessible by both control hardware and/or software.
  • the closed loop power control setting is also monitored.
  • the radio telephone uses the detected power levels and closed loop power control setting to index a set of correction tables that indicate the reverse link transmit power error and desired power amplifier biasing for the particular operating point.
  • the radiotelephone also determines if the transmitter is operating above a maximum set point. The transmitter gain and power amplifier biasing of the radiotelephone are adjusted to correct the undesired error and maintain the desired output power.
  • GB-A-2 313 741 suggests reducing a peak current drawn from a battery in a communication device by selectively switching parts of the device during transmission and reception of radio frequency signals, which allows for operating a voltage converter connected to the battery within its region of maximum efficiency. Switches are used to remove operating power from a display during transmit and receive time slots without it being perceptible to a user, and for providing operating power to a transmit circuit and received circuit only during respective transmit and receive time slots.
  • a power supply apparatus for a mobile communication terminal including a transmitter and baseband signal processor, a transmitter and a power amplifier.
  • the power supply apparatus includes a DC/DC converter for converting a DC voltage from a battery.
  • the power supply apparatus regulates the DC voltage converted by the DC/DC converter and supplies the regulated DC voltage to the receiver and baseband signal processor.
  • the power supply apparatus converts the DC voltage converted by the DC/DC converter to a DC voltage corresponding to a transmission AGC (Automatic Gain Control) voltage determined depending on a transmission power and supplies the converted DC voltage to the receiver and baseband signal processor, the transmitter and the power amplifier.
  • AGC Automatic Gain Control
  • the power supply apparatus uses a single DC/DC converter and adaptively varies the output voltage of the DC/DC converter according to the transmission power in the transmission mode. Therefore, the power supply apparatus is favorable for a reduction in size of the mobile communication terminal and for a reduction in power loss of the voltage regulators and the power amplifier, thereby maximizing the power efficiency and extending the battery life.
  • FIG. 2 illustrates a power supply apparatus for a mobile communication terminal according to an embodiment of the present invention.
  • the power supply apparatus down-converts a DC voltage supplied from a rechargeable battery 10 and provides the down-converted DC voltage to respective elements of the mobile communication terminal.
  • the novel power supply apparatus employs a single DC/DC converter 20, thereby contributing to a reduction in size of the overall mobile communication terminal.
  • the power supply apparatus of the invention maximizes a power efficiency of the mobile communication terminal by adaptively controlling the power supply voltage.
  • the power supply apparatus provides a constant DC voltage 5V to a receiver and baseband signal processor 30, a transmitter 42 and a power amplifier 44. Accordingly, regulators which can normally operate even with a DC voltage 3.9V, may cause a unnecessary power consumption.
  • a transmitter of a mobile communication terminal employing PSK (Phase Shift Keying) modulation uses a class A or class AB power amplifier for linear amplification.
  • a power efficiency of such a linear power amplifier is abruptly decreased, as the output power becomes lower than a saturation output power.
  • Supplying the constant DC voltage to this power amplifier may additionally decrease the power efficiency.
  • a transmission power at an antenna port is controlled in the 82dB range between-50dBm and 32dBm.
  • the power efficiency is 10% at the most.
  • the power amplifier should be provided with the DC voltage 5.0V as an operating voltage.
  • the power supply apparatus adaptively varies the operating voltage from 3.9V to 5.0V in proportion to the output power in the transmission mode, instead of supplying the constant operating voltage 5.0V. As a result, when the transmission power is low, the power supply apparatus decreases the output voltage of the DC/DC converter 20 to reduce a relative voltage difference between the DC/DC converter 20 and respective regulators, and provides the power amplifier with a low voltage.
  • the battery 10 provides a DC voltage 7.2V.
  • the DC/DC converter 20 has an input end, an output end and a feedback end. The input end receives the DC voltage from the battery 10, and the output end is connected to a peripheral circuit 50. Further, the feedback end outputs a constant DC voltage V FB .
  • a resistor R2 is connected between an output end of the peripheral circuit 50 and the feedback end of the DC/DC converter 20, and a resistor R1 is connected between the feedback end and the ground.
  • a voltage control current source 60 is connected in parallel with the resistor R1.
  • the voltage control current source 60 receives a transmission automatic gain control (TX_AGC) voltage which is variable according to the transmission power, and controls a current I C depending on the received TX_AGC voltage. Variation of the current I C will change a current I T flowing through the resistor R2, thereby varying the output voltage V OUT of the DC/DC converter 20.
  • TX_AGC transmission automatic gain control
  • the mobile communication terminal requires the output voltage V OUT of 3.9V in the reception mode and the output voltage V OUT of 3.9-5.0V in the transmission mode.
  • the power supply apparatus provides the mobile communication terminal with the constant DC voltage 3.9V in the reception mode and the variable DC voltage 3.9-5.0V in the transmission mode.
  • the voltage V OUT of 3.9V is applied in common to voltage regulators 72 and 74.
  • a switch SW is turned off (or opened) in response to an inactivated transmission mode signal TX_MODE so that the output voltage V OUT may not be provided to a voltage regulator 76 and the power amplifier 44.
  • the voltage regulators 72 and 74 regulate the voltage V OUT into DC voltages 3.3V and 3.6V, respectively and supply the regulated voltages to the receiver and baseband signal processor 30.
  • the output voltage V OUT of 3.9-5.0V is applied to the voltage regulator 76 and the power amplifier 44 as well as the voltage regulators 72 and 74, because the switch SW is turned on (or closed) in response to the activated transmission mode signal TX_MODE.
  • the voltage regulator 76 regulates the voltage V OUT of 3.9-5.0V into a DC voltage 3.6V and provides the regulated DC voltage to the transmitter 42.
  • the voltage V OUT of 3.9-5.0V is supplied to the power amplifier 44 as an operating voltage, through the switch SW. That is, in the transmission mode, the voltage V OUT of 3.9-5.0V is supplied to the receiver and baseband signal processor 30, the transmitter 42 and the power amplifier 44.
  • the voltage control current source 60 includes a transistor Q, being a switching element, which is switchable according to the received TX_AGC voltage.
  • the transistor Q has a base connected to the TX_AGC voltage through a resistor R3, a collector connected to the feedback end of the DC/DC converter 20, and an emitter connected to the ground through a resistor R5. Between the base of the transistor Q and the ground, a resistor R4 and a capacitor C are connected in parallel to each other.
  • the TX_AGC voltage is zero in the reception mode, and increases in proportion to the transmission power in the transmission mode.
  • the transmission power at the antenna port is controlled in the 82dB range between -50dBm and 32dBm as shown in FIG. 4B, so that the TX_AGC voltage corresponding to this power range is 0.5-2.7V.
  • the collector current I C is substantially identical to the emitter current I B .
  • V B ⁇ V AGC ⁇ R 4 / ( R 3 + R 4 ) ⁇ ⁇ 0.7 [ V ]
  • the collector current I C of the transistor Q depends on the TX_AGC voltage V AGC .
  • the novel power supply apparatus adaptively varies the output voltage of the DC/DC converter 20 according to the transmission power in the transmission mode, so that the power loss of the mobile communication terminal may be reduced thereby extending the battery life.
  • FIG. 4A illustrates the situation that the power supply apparatus of the invention varies the output voltage; V OUT of the DC/DC converter 20 according to a change of the transmission power.
  • the TX_AGC voltage V AGC is used to detect the change of the transmission power.
  • FIG. 4C illustrates the situation that the power supply apparatus varies the output voltage V OUT of the DC/DC converter 20 according to a change of the TX_AGC voltage V AGC .
  • the power supply apparatus uses the TX_AGC voltage V AGC , and this TX_AGC voltage V AGC is determined by a baseband (B/B) chip 90 shown in FIG. 5.
  • FIG. 5 illustrates an IS-95 CDMA communication terminal.
  • the detailed description of the respective elements will be avoided. Instead, the description will be given as to only how the baseband chip 90 determines the TX_AGC voltage.
  • the baseband chip 90 determines the TX_AGC voltage for controlling the transmission power and applies the determined TX_AGC voltage to a TX_AGC circuit 92.
  • This power control operation may be divided into two operations.
  • a first power control operation is an open loop power control operation which is performed in accessing a base station initially.
  • the baseband chip 90 detects an RSSI (Received Signal Strength Indicator) value and determines a transmission power associated with the detected RSSI value.
  • RSSI Receiveived Signal Strength Indicator
  • a second power control operation is a closed loop control operation which is performed after the terminal is the connected to the base station by the first power control operation.
  • the terminal receives a transmission power information command transferred from the base station and determines the TX_AGC voltage so as to output the transmission power corresponding to the transmission power information command.
  • the power supply apparatus of the invention adaptively supplies the DC voltage V OUT according to the transmission power, in the transmission mode.
  • the novel power supply apparatus uses a single DC/DC converter and adaptively varies the output voltage of the DC/DC converter according to the transmission power in the transmission mode. Therefore, the power supply apparatus is favorable for a reduction.in size of the mobile communication termmal and for a reduction in power loss of the voltage regulators and the power amplifier, thereby maximizing the power efficiency and extending the battery life.
  • the voltage 3.9V in the reception mode and the voltage 3.9-5.0V in the transmission mode may be changed according to the type of the mobile communication terminals.
  • the down-converter may be replaced with an up-converter.
  • the transistor used for the voltage control current source may be replaced with any type of the switching element, such as a field effect transistor (FET). That is, the power supply apparatus according to the present invention can be applied to any of the CDMA, GSM and FM (Frequency Modulation) communication terminals.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Dc-Dc Converters (AREA)

Claims (10)

  1. Verfahren zum Steuern einer Energieversorgungsspannung in einem Mobilkommunikations-Endgerät, das einen Empfänger und einen Basisband-Signalprozessor (30), einen Sender (42), einen Sendeleistungsverstärker (44) und einen Schalter (SW) zum Umschalten zwischen einem Empfangsmodus und einem Sendemodus des Mobilkommunikations-Endgerätes enthält, wobei es die folgenden Schritte umfasst:
    a) Zuführen einer Gleichspannung mittels einer Batterie (10);
    b) Umwandeln der Gleichspannung von der Batterie (10) in eine konstante Gleichspannung mittels eines Gleichstromwandlers (20);
    und in dem Empfangsmodus:
    c1) Bereitstellen einer Empfangsmodus-Ausgangsspannung an einem Ausgangsende des Gleichstromwandlers (20) in Abhängigkeit von der konstanten Gleichspannung;
    c2) Regulieren der Empfangsmodus-Ausgangsspannung, und
    c3) Zuführen der regulierten Empfangsmodus-Ausgangsspannung zu dem Empfänger und dem Basisband-Signalprozessor (30);
    und in dem Sendemodus
    d1) Bereitstellen einer Sendemodus-Ausgangsspannung an dem Ausgangsende des Gleichstromwandlers in Abhängigkeit von der konstanten Gleichspannung sowie von einer Spannung der automatischen Sende-Verstärkungsregelung, die entsprechend einer Sende-Ausgangsleistung bestimmt wird; und
    d2) Zuführen der Sendemodus-Ausgangsspannung zu dem Empfänger und dem Basisband-Signalprozessor (30), dem Sender (42) und dem Sendeleistungsverstärker (44).
  2. Verfahren nach Anspruch 1, wobei Schritt d2) den Schritt des Regulierens der Sendemodus-Ausgangsspannung umfasst, um dem Empfänger und dem Basisband-Signalprozessor (30) sowie dem Sender (42) eine regulierte Sendemodus-Ausgangsspannung zuzuführen.
  3. Verfahren nach Anspruch 2, wobei in Schritt c2) die Empfangsmodus-Ausgangsspannung auf zwei regulierte Empfangsmodus-Ausgangsspannungen reguliert wird, die in Schritt c3) dem Empfänger und dem Basisband-Signalprozessor (30) zugeführt werden, und in Schritt d2) die Sendemodus-Ausgangsspannung auf drei regulierte Sendemodus-Ausgangsspannungen reguliert wird, die ersten zwei regulierten Sendemodus-Ausgangsspannungen dem Empfänger sowie dem Basisband-Signalprozessor (30) zugeführt werden und die dritte regulierte Sendemodus-Ausgangsspannung dem Sender (42) zugeführt wird.
  4. Energieversorgungsvorrichtung für ein Mobilkommunikations-Endgerät, das einen Empfänger und einen Basisband-Signalprozessor (30), einen Sender (42) und einen Sendeleistungsverstärker (44) enthält, wobei die Vorrichtung umfasst:
    eine Batterie (10) zum Zuführen einer Gleichspannung;
    einen Gleichstromwandler (20) mit einem Eingangsende, einem Ausgangsende und einem Rückführungsende zum Umwandeln der von der Batterie (10) am Eingangsende zugeführten Gleichspannung in eine konstante Gleichspannung und zum Ausgeben der konstanten Gleichspannung an dem Rückführungsende;
    eine Spannungssteuerungs-Stromquelle (60), die zwischen das Rückführungsende und eine Erde geschaltet ist, um in einem Sendemodus eine Ausgangsspannung an dem Ausgangsende des Gleichstromwandlers (20) entsprechend einer Spannung einer automatischen Sende-Verstärkungsregelung, die entsprechend einer Sende-Ausgangsleistung bestimmt wird, adaptiv zu ändern;
    eine Reguliereinrichtung zum Regulieren der Ausgangsspannung des Gleichstromwandlers (20) und zum Zuführen der regulierten Ausgangsspannung zu dem Empfänger und dem Basisband-Signalprozessor (30); und
    einen Schalter (SW), der zwischen das Ausgangsende des Gleichstromwandlers (20) und den Sender (42) sowie den Leistungsverstärker (44) geschaltet ist und während des Sendemodus geschlossen ist, um die Ausgangsspannung des Gleichstromwandlers (20) zu dem Sender (42) und dem Leistungsverstärker (44) zu übertragen.
  5. Energieversorgungszuführvorrichtung nach Anspruch 4, wobei die Spannungsreguliereinrichtung einen ersten Spannungsregler (72) sowie einen zweiten Spannungsregler (74) zum Regulieren der Ausgangsspannung des Gleichstromwandlers (20) auf eine erste und eine zweite regulierte Ausgangsspannung und zum Zuführen der ersten sowie der zweiten regulierten Ausgangsspannung zu dem Empfänger und dem Basisband-Signalprozessor (30) umfasst, und des Weiteren einen dritten Regler (76) umfasst, der zwischen den Schalter (SW) und den Sender (42) geschaltet ist, um die Ausgangsspannung des Gleichstromwandlers (20) zu regulieren und die dritte regulierte Ausgangsspannung dem Sender (42) zuzuführen.
  6. Energieversorgungsvorrichtung nach Anspruch 4 oder 5, die des Weiteren einen ersten Widerstand (R2), der zwischen das Ausgangsende und das Rückführungsende des Gleichstromwandlers (20) geschaltet ist, sowie einen zweiten Widerstand (R1) umfasst, der zwischen das Rückführungsende und die Erde geschaltet ist, und wobei die Spannungssteuer-Stromquelle (60) die Ausgangsspannung an dem Ausgangsende des Gleichstromwandlers (20) adaptiv ändert, indem sie einen durch den ersten Widerstand (R2) fließenden Strom entsprechend der Spannung der automatischen Sende-Verstärkungssteuerung in dem Sendemodus ändert.
  7. Energieversorgungsvorrichtung nach Anspruch 6, wobei in einem Empfangsmodus die Spannungssteuer-Sromquelle (60) einen ersten Strom durch den ersten Widerstand (R2) leitet, um eine erste Ausgangsspannung an dem Ausgangsende auszugeben, die durch eine Gleichspannung an dem Rückführungsende und ein Spannungsgefälle über den ersten Widerstand (R2) bestimmt wird; und wobei in dem Sendemodus die Spannungssteuer-Stromquelle (60) einen zweiten Strom, der dem ersten Strom (R2) gleich ist oder höher als dieser, durch den ersten Widerstand leitet, um eine zweite Ausgangsspannung an dem Ausgangsende auszugeben, wobei die zweite Ausgangsspannung eine veränderliche Spannung ist, die der ersten Ausgangsspannung gleich ist oder höher als diese.
  8. Energieversorgungsvorrichtung nach Anspruch 6, wobei die Spannungssteuer-Stromquelle (60) umfasst:
    ein Eingangsende zum Empfangen der Spannung der automatischen Sende-Verstärkungsregelung, die entsprechend der Sendeleistung bestimmt wird; und
    ein Schaltelement (Q), das geschlossen wird, um einen Stromweg zwischen dem Rückführungsende und der Erde herzustellen, wenn die Spannung der automatischen Sende-Verstärkungsregelung einen vorgegebenen Wert hat, um so den Strom zu erhöhen, der durch den ersten Widerstand (R2) fließt.
  9. Energiezuführvorrichtung nach Anspruch 8, wobei das Schaltelement (Q) ein Transistor ist, der eine Basis, die mit dem Eingangsende verbunden ist, einen Kollektor, der mit dem Rückführungsende verbunden ist, und einen Emitter hat, der mit der Erde verbunden ist.
  10. Energiezuführvorrichtung nach Anspruch 9, die des Weiteren umfasst:
    einen Widerstand (R2), der zwischen das Eingangsende und die Basis des Transistors (Q) geschaltet ist; und
    einen Widerstand (R4), der zwischen die Basis und die Erde geschaltet ist.
EP99102881A 1998-03-05 1999-03-04 Stromversorgungseinrichtung und Verfahren für ein mobiles Fernsprech- Endgerät Expired - Lifetime EP0940963B1 (de)

Applications Claiming Priority (2)

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KR1019980007288A KR100264897B1 (ko) 1998-03-05 1998-03-05 이동통신 단말기의 전원공급방법 및 장치
KR9807288 1998-03-05

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EP0940963A2 EP0940963A2 (de) 1999-09-08
EP0940963A3 EP0940963A3 (de) 1999-09-15
EP0940963B1 true EP0940963B1 (de) 2006-08-02

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US (1) US6374127B1 (de)
EP (1) EP0940963B1 (de)
JP (1) JP3079095B2 (de)
KR (1) KR100264897B1 (de)
CN (1) CN1096140C (de)
CA (1) CA2264446C (de)
DE (1) DE69932554T2 (de)

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KR19990073978A (ko) 1999-10-05
EP0940963A3 (de) 1999-09-15
CN1236217A (zh) 1999-11-24
DE69932554D1 (de) 2006-09-14
EP0940963A2 (de) 1999-09-08
US6374127B1 (en) 2002-04-16
CA2264446A1 (en) 1999-09-05
KR100264897B1 (ko) 2000-09-01
JP3079095B2 (ja) 2000-08-21
DE69932554T2 (de) 2006-11-30
JPH11298342A (ja) 1999-10-29
CA2264446C (en) 2003-05-20

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